I have a ton of custom column data that I would like to automatically be pulled into PSM. I would like to be able to run calculations on the imported data. I would like to have the data in a spreadsheet and the columns for the spreadsheets match the columns in PSM. I have several different programs that I would like to aggregate data from and use it in PSM.

Why couldn't you write an extension that can do this and provide it to all users.